The best replacement for hardtop is coupe.

The best alternatives to hardtop are rated as following:
★★★★★  coupe
★★★★★  sedan
★★★★  soft top
★★★  convertible
★★  soft top convertible
★★  soft top jeep
★★  clubman
★★  soft top wrangler
★  post
★  softop
★  soft top s2000
★  xb gt coupe
★  soft top miata
★  softtop
★  hardtop
  targa top supra
  targa
  t-tops
  softtop convertible
  coupe gto
  sport coupe

Your alternative for hardtop is not listed? Suggest!
Speaking about hardtop, one probably shouldn't forget about half doors.

Other search terms related to hardtop and their ratings are:
★★★★★ half doors
★★★ upper doors
★ soft doors
★ glass window for 99 porsche boxster
You have in mind a companion for hardtop and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hardtop in all years. Click on graph for more.
hardtop
coupe
sedan